Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8

Closed
#31
Closed
Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
#31
Labels
P1Should fix before next releasebugSomething isn't working

Description

@AndresL230
AndresL230
opened on May 13, 2026

Summary

Three related body-sizing issues:

1. aiohttp json= and FormData report 0 bytes

recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.

2. httpx streaming body silently materialized

_interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.

3. Response body size derived from Content-Length only

Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.

Fix

  • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
  • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
  • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.

Files

  • recost/_interceptor.py
  • README.md
  • tests/test_interceptor.py

Priority

P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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function addCopyButtons() {
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btn.onmouseout = function() { this.style.opacity = '0.7'; };
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navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
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var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
      Closed
      #31
      Closed
      Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
      #31
      Labels
      P1Should fix before next releasebugSomething isn't working
      Description
      @AndresL230
      AndresL230
      opened on May 13, 2026
      Summary
      Three related body-sizing issues:
      1. aiohttp json= and FormData report 0 bytes
      recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
      2. httpx streaming body silently materialized
      _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
      3. Response body size derived from Content-Length only
      Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
      Fix
      • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
      • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
      • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
      Files
      • recost/_interceptor.py
      • README.md
      • tests/test_interceptor.py
      Priority
      P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        P1Should fix before next releasebugSomething isn't working
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
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var style = document.createElement('style');
style.textContent = '
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color-scheme: dark light;
}
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.markdown-body hr { border-color: #30363d; }
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document.head.appendChild(style);
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} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
          Closed
          #31
          Closed
          Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
          #31
          Labels
          P1Should fix before next releasebugSomething isn't working
          Description
          @AndresL230
          AndresL230
          opened on May 13, 2026
          Summary
          Three related body-sizing issues:
          1. aiohttp json= and FormData report 0 bytes
          recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
          2. httpx streaming body silently materialized
          _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
          3. Response body size derived from Content-Length only
          Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
          Fix
          • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
          • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
          • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
          Files
          • recost/_interceptor.py
          • README.md
          • tests/test_interceptor.py
          Priority
          P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            P1Should fix before next releasebugSomething isn't working
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
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              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
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var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
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highlight(document.body);
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var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
              Closed
              #31
              Closed
              Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
              #31
              Labels
              P1Should fix before next releasebugSomething isn't working
              Description
              @AndresL230
              AndresL230
              opened on May 13, 2026
              Summary
              Three related body-sizing issues:
              1. aiohttp json= and FormData report 0 bytes
              recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
              2. httpx streaming body silently materialized
              _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
              3. Response body size derived from Content-Length only
              Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
              Fix
              • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
              • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
              • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
              Files
              • recost/_interceptor.py
              • README.md
              • tests/test_interceptor.py
              Priority
              P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                P1Should fix before next releasebugSomething isn't working
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
                  Closed
                  #31
                  Closed
                  Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
                  #31
                  Labels
                  P1Should fix before next releasebugSomething isn't working
                  Description
                  @AndresL230
                  AndresL230
                  opened on May 13, 2026
                  Summary
                  Three related body-sizing issues:
                  1. aiohttp json= and FormData report 0 bytes
                  recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
                  2. httpx streaming body silently materialized
                  _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
                  3. Response body size derived from Content-Length only
                  Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
                  Fix
                  • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
                  • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
                  • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
                  Files
                  • recost/_interceptor.py
                  • README.md
                  • tests/test_interceptor.py
                  Priority
                  P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    P1Should fix before next releasebugSomething isn't working
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
                      Closed
                      #31
                      Closed
                      Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
                      #31
                      Labels
                      P1Should fix before next releasebugSomething isn't working
                      Description
                      @AndresL230
                      AndresL230
                      opened on May 13, 2026
                      Summary
                      Three related body-sizing issues:
                      1. aiohttp json= and FormData report 0 bytes
                      recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
                      2. httpx streaming body silently materialized
                      _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
                      3. Response body size derived from Content-Length only
                      Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
                      Fix
                      • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
                      • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
                      • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
                      Files
                      • recost/_interceptor.py
                      • README.md
                      • tests/test_interceptor.py
                      Priority
                      P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        P1Should fix before next releasebugSomething isn't working
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
                          Closed
                          #31
                          Closed
                          Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
                          #31
                          Labels
                          P1Should fix before next releasebugSomething isn't working
                          Description
                          @AndresL230
                          AndresL230
                          opened on May 13, 2026
                          Summary
                          Three related body-sizing issues:
                          1. aiohttp json= and FormData report 0 bytes
                          recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
                          2. httpx streaming body silently materialized
                          _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
                          3. Response body size derived from Content-Length only
                          Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
                          Fix
                          • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
                          • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
                          • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
                          Files
                          • recost/_interceptor.py
                          • README.md
                          • tests/test_interceptor.py
                          Priority
                          P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            P1Should fix before next releasebugSomething isn't working
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                              Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only #8
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                              #31
                              Closed
                              Interceptor body-size measurement: aiohttp json=, httpx streaming, Content-Length only#8
                              #31
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                              P1Should fix before next releasebugSomething isn't working
                              Description
                              @AndresL230
                              AndresL230
                              opened on May 13, 2026
                              Summary
                              Three related body-sizing issues:
                              1. aiohttp json= and FormData report 0 bytes
                              recost/_interceptor.py:317-325 checks only the data= kwarg. The most common aiohttp POST patterns (session.post(url, json={...}), session.post(url, data=FormData(...)), async-iterable bodies, BytesIO) all fall through and report 0.
                              2. httpx streaming body silently materialized
                              _interceptor.py:198-201, 244-247 accesses request.content to compute body size. For ordinary requests built via client methods, content is bytes — fine. For users passing a custom streaming body (httpx.Request("POST", url, content=async_iterator)), accessing content reads and buffers the entire iterator. A large upload silently OOMs the process.
                              3. Response body size derived from Content-Length only
                              Chunked / streaming responses (LLM SSE streams) don't set the header; they always report response_bytes=0. The README's "response body size (bytes)" promise is partially false for streams.
                              Fix
                              • For aiohttp: when json= is present, JSON-serialize and measure; for FormData, query its _size; for unknown body types, leave at 0 but document.
                              • For httpx: isinstance(request.content, bytes) check before reading. Non-bytes → skip size measurement.
                              • For responses: document the streaming caveat in README; optionally tee non-streaming response bodies.
                              Files
                              • recost/_interceptor.py
                              • README.md
                              • tests/test_interceptor.py
                              Priority
                              P1 — undercounts bytes for the most common modern HTTP patterns; OOM risk on streaming uploads.
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